Hello, I have this problem I haven't been able to solve in weeks. I have a web service SOAP/PHP which needs to connect to a client's web service, but the client requires authentication based on SSL certificates. From what I understand they expect that I send during connection their public certificate back to them so they can authenticate who I am. They accomplished this on their side by importing my public certificate into theirs using a tool called ikeyman. We tried the same, but have been unsuccessful. My question is how can I accomplish this under Apache? Some background info: - products used and releases Apache 2.2.3, PHP 5.x, MySQL 5.x - platforms used On my side, Linux, Red Hat Enterprise 5.3, and on the client's side they are running IBM WebSphere - ssl mod_ssl is properly configured under my Apache server. Certificates have been generated using OpenSSL and SSL encryption has also been successfully accomplished. However, as stated before, the client expects to get their certificate back everytime I connect to their web service in order to authenticate. Unless this happens, connecion by their server is refused. Any comments will be greatly appreciated. Thank you very much. Gian Pier